高浓度氩气稀释对C2H2-2.5O2气体直接起爆临界能量影响的实验研究

 采用高压电点火进行直接起爆，通过放电过程中电流的输出信号确定起爆能量，实验测定了C₂H₂-2.5O₂气体和加入摩尔浓度为70%氩气的C₂H₂-2.5O₂混合气体直接起爆的临界起爆能量，研究了高浓度氩气稀释对C₂H₂-2.5O₂混合物临界起爆能量的影响。实验测得的混合物临界起爆能量实验值与Lee等人的表面积能量理论值基本吻合。研究表明：C₂H₂-2.5O₂气体和加入摩尔浓度为70%氩气的C₂H₂-2.5O₂混合气体的临界起爆能量均依赖于初始压力，并呈反相关指数关系；在相同实验条件下，高浓度氩气稀释极大提高了混合气体直接起爆的临界起爆能量。分析认为，由于临界起爆能量正比于诱导区长度的3次方，因此在相同初始压力下，高浓度氩气的稀释增加了C₂H₂-2.5O₂混合气体爆轰诱导区长度，并最终导致其临界起爆能量的显著上升。

Experimental Investigation of the Influence of Highly Argon Dilution on the Critical Initiation Energy for Direct Initiation of C2H2-2.5O2 Mixtures

Direct initiation is achieved via a high voltage capacitor spark discharge,and the critical energy is accurately estimated from the analysis of the current output.A good agreement is found by comparing the critical initiation energy from experimental measurement and Lee’s surface energy model.The influences of highly argon dilution on the critical energy of direct initiation are investigated experimentally for C2H2-2.5O2 and 70% argon diluted C2H2-2.5O2 mixtures.The results show that the critical energy is inversely exponential to the initial pressure for C2H2-2.5O2 mixtures with and without highly argon.Both the experimental and theoretical results indicate that dilution of highly argon in C2H2-2.5O2 enhances the critical initiation energy for direct initiation at the same initial condition.Since the critical initiation energy is proportional to the cube of ZND induction zone length,the dilution of highly argon increases the ZND induction zone length of C2H2-2.5O2 mixture under the same initial pressure,and accordingly the critical initiation energy is raised remarkably.